Printing press



Dec. 26, 1961 R. T. TOWNSEND PRINTING PRESS 4 Sheets-Sheet 1 Filed April21, 1958 1961 R. T. TOWNSEND 3,014,421

PRINTING PRESS 4 Sheets-Sheet 2 Filed April 21, 1958 4 Sheets-Sheet 5 R.T. TOWNSEND PRINTING PRESS Qoberl' T Tbwnsend Dec. 26, 1961 Filed April21, 1958 EYE imm w M R. T. TOWNSEND Dec. 26, 1961 PRINTING PRESS 4Sheets-Sheet 4 Filed April 21, 1958 gmvamov @dbwl' TI %wnsan&

Patented Dec. 26, 1961 3,014,421 PRINTING PRESS Robert T. Townsend, 427E. Walnut St., Des Moines, Iowa Filed Apr. 21, 1958, Ser. No. 729,849Claims. (Cl. 101-177) This invention relates to a printing press andparticularly one in the form of an attachment for an existing printingpress of the offset type, the attachment enabling the printing of asecond color on the blanket cylinder of the existing press in additionto the single color normally applied thereto.

One object of the invention is to provide an attachable printing pressincluding a plate cylinder and moistening and inking means therefor, theplate cylinder printing an impression on the blanket cylinder of theexisting printing press in addition to the impression already thereon sothat both colors are transferred at the same time from the blanket tothe paper being fed through the press, thus accomplishing multi-color,single impression print- Another object is to provide an attachmentwhich is so designed as to eliminate the necessity of drilling any holesin the frame of the existing press for mounting of the attachment.

A further object is to provide mounting brackets which are mounted onthe existing press by means of set screws, and my attachable printingpress is then mounted on these brackets in such manner as to be readilydemountable therefrom when desired.

- Still a further object is to provide the mounting means for myprinting press on the brackets of such character that the plate cylinderof my attachable press may be adjusted into parallelism with the blanketcylinder of the existing press and locked in that position in suchmanner that thereafter demounting of the attachable press and mountingthereof can be accomplished with assurance that the plate cylinder ofthe attachable press will always be parallel to the blanket cylinder ofthe existing press, thus insuring perfect registration of the colorapplied by the attachable press with that of the existing press on theblanket of the blanket cylinder, and the registration held indefinitelyeven though the attachable press is demounted from time to time when notneeded.

An additional object is to provide a micro-adjustment for the platecylinder of my attachable press that eliminates the necessity ofshifting the plate on the cylinder to obtain registration with theimpression on the blanket of the blanket cylinder, and a means toprevent ink from building up beyond the edge of the plate andtransferring to the blanket and then to the paper being printed.

Another additional object is to provide water and ink fountains whichare readily removable to facilitate cleaning thereof.

With these and other objects in view, my invention consists in theconstruction, arrangement and combination of the various parts of myprinting press, whereby the objects above contemplated are attained, ashereinafter more fully set forth, pointed out in my claims andillustrated in detail on the accompanying drawings, wherein:

FIG. 1 is a perspective view of my printing press showing it mounted onthe frame of an existing press;

FIG. 2 is a perspective view of a water trough of the dampening unit ofmy press illustrating the removability thereof;

FIG. 3 is an enlarged vertical sectional view on the line 33 of FIG. 1and shows the cooperation of the plate cylinder of my press with theblanket cylinder of the existing press on which it is mounted;

FIGS. 3 and 3 are fragmentary detail views of a portion of FIG. 3showing different adjustments of my printing press;

FIG. 4 is a horizontal sectional view on the line 4-4 of FIG. 3;

FIG. 5 is a frontview of FIG. 4 as taken on the indicated line 5-5 ofFIG. 4;

FIG. 6 is a vertical sectional view on the line 6-6 of FIG. 3illustrating the micro-adjustment for the plate cylinder of my printingpress;

FIG. 7 is a perspective view with portions cut away and other portionsshown in section to illustrate certain features of the micro-adjustmentshown in FIG. 6; and

FIG. 8 is an enlarged elevation of the right-hand end of FIG. 6.

On the accompanying drawings I have used the reference numerals 10 and12 to indicate the left and right side frames respectively of anexisting printing press such as a Multilith printing press. Myattachment press rests on the side frames 10 and 12. The existing pressalso includes right and left frame members 14 and 16 each of which has aflange 18 to which I attach left and right brackets 20 and 22 formounting my printing press as will now be described.

Each bracket 20 and 22 has a pair of U-shaped lugs 24 as shown in FIG. 3which extend over the edges and back of the flanges 18 so that setscrews 26 may be set against the outsides of the flanges 18 and setscrews 28 may be set against the insides thereof, thus rigidly mountingthe brackets 20 and 22 on the frame of the existing printing press. ThusI provide four sets of twoset screws each bearing directly across theflanges 18 from each other without placing undue strain on the flangesbecause of this arrangement of the set screws. This type of mountingeliminates the necessity of drilling holes in such frame for mounting myattachment and at the same time provides brackets that are so mountedthat they remain in fixed positions relative to such frame so that myattachment may be mounted on the brackets and adjusted, and will retainsuch adjustment even after demounting and mounting of the attachmentrelative to the brackets. Thus the existing machine is not defaced orimpaired in any manner.

Describing my attachment printing press and its mounting on the brackets20 and 22, I provide in general a pair of side frames 30 and 32 (leftand right respectively) which are normally enclosed in guards and 162, aplate cylinder 34, a dampening system therefor and an inking systemtherefor. The dampening system includes a water trough 36, a ductor roll38, an oscillating transfer roll 40, an intermediate transfer roll 42, adistributor roll 44 (which is reciprocated axially) and a form roll 46.The inking system includes an ink trough 47, a ductor roll 43, a doctorblade 49 and the usual series of set screws 51 for adjusting thepressure thereof against the ductor roll 48, an oscillating transferroll '56, an intermediate transfer roll 52., a distributor roll 54(which reciprocates axially), a form roll 56, a second reciprocatingdistributor roll 58, and a form roll 60. The dampening system and theinking system are substantially the same as used on the existing presshereinbefore mentioned and in many types of offset printing machines nowon the market, and in general forms no part .of my present invention.Likewise, the mechanism for oscillating the rollers 40 and 5t and forreciprocating the rollers 44 and 58 is not shown as it is substantiallythe same as found in Multilith and other printing presses and forms nopart of my present invention. I do, however, provide novel means forquickly removing the water trough 36 and the fountain attached theretoas well as the ink trough 47 for ease of cleaning between printing jobsor when otherwise necessary.

Reference is made to FIGS. 2 and 3 wherein it will be noted that thewater trough 36 and the ink trough 47 are provided with end member 72and 72 respectively having round bores 74 and 74 interrupted by slots 76and '76 somewhat narrower than the diameters of the bores. The sideframes 30 and 32 have round studs 78 and 78 for the bores 74 and 74 ofthe end members 72 and 72 provided with fiat spots 80 and 80 so that thewater trough 36 may be tilted about 60 counterclockwise in FIG. 3 (afterthe Water supply bottle 82 has been removed from the neck 84) and theentire trough removed in a downward direction toward the right so thatit can be cleaned while removed from the machine. Likewise, the inkfountain 47 may be tilted about 30 counterclockwise in FIG. 3 and thenremoved upwardly and toward the right for cleaning such as at the end ofthe day or between color changes.

In referring to a water system it is to be understood that the usualfluid actually involved is a weak acid solution and its purpose is torepel the ink from the nonimage areas of the printing plate 35. Thereare many variations of. this solution which will have a tendency toprecipitate a residue which fioats on the surface, thus hindering thetransfer of water through the various rolls to the printing plate.Periodically (usually once each day) this must be wiped from thefountain roll and trough. In the existing machine this can beaccomplished only partially since the trough is stationary and theremoval of the roll quite complicated. With my system the trough isrotated on the studs 78 until the slots 76 are aligned with the Hatsides 80 and the trough may be quickly removed which facilitates easycleanup.

My attachment press is mounted on the brackets 20 and 22 by means of asupporting rod 86 (see FIGS. 4 and mounted in the side frames 30 and 32serving as a spacer therefor. The supporting rod 86 extends throughhorizontal perforations through the heads of three shouldered studs 88,90 and 92 which rest on a supporting bar 96 and are provided with locknuts 98 on their reduced threaded ends to lock them thereto. The stud 88is pivoted to the bar while the studs 90 and 92 have limited adjustmentrelative thereto as indicated by arrows A in FIG. 4 and as permitted byslots 100 in the bar 96 (these slots are shown dotted in FIG. 4). Setcollars 94 are mounted on the supporting rod 86 to limit itslongitudinal movement relative to the stud 88 and may be loosened forlateral adjustment of the entire attachment press relative to theexisting press during the initial installation thereon. The stud 88serves as a pivot point for the supporting rod 86 and the studs 90 and92 together with their lock nuts 98 serve to lock the rod againstpivoting.

The supporting bar 96 is mounted on ears 102 at the lower ends of thebrackets 20 and 22 by means of cap screws 104 in each ear, and forwardand rearward leveling screws 106 and 108 respectively, the purpose ofwhich will hereinafter appear.

In addition to the parts just described under reference numerals 86through 108, a yoke connection is provided between my attachmentprinting press and the brackets 20 and 22 comprising a yoke rod 110 anda pair of turnbuckles 112 connecting the ends thereof to the ends of theshaft for the pltae cylinder 34 which shaft is indicated 114. The rod110 is adapted to enter through slots 116 of the brackets 20 and 22 thatterminate in round bores 118 (see FIGS. 3 and 3 The yoke rod 110 issmall enough in diameter to pass through the slots 116 and is smallerthan the bores 118, the intermediate space being filled with bushings120. As shown in FIG. 4, these bushings are slidable along the rod 110to the dotted position shown for a purpose which will hereinafter appearand it will also be noted that the ends of hte bores 118 are countersunkas indicated at 119 to provide a relatively narrow contact of the borewith the bushing to facilitate alignment as will be described later.

Referring to FIG. 3, a gear is shown on the blanket cylinder 62 meshingwith gears on the plate cylinders 34 and 64, and other gears drive theform rollers 46, 56 and 60, all in timed relation to the blanketcylinder in the usual manner. Since this is the usual conventionalconstruction I have not referred to the gears by reference numerals. Theplate cylinder 34 is provided with a printing plate 35 having its endssecured to cross bars 37 and 39, the bar 39 being adjustable as is usualconstruction.

Referring to FIGS. 6, 7 and 8, a micro-adjustment for horizontalmovement of the plate cylinder 34 is shown. The plate cylinder shaft 114journalled in the side frames 30 and 32 has eccentric ends on which theturnbuckles 112 are mounted so that oscillation of this shaft can movethe plate cylinder and in fact the entire attachment printing pressabout the supporting shaft 86 as a pivot to place the printing plate 35selectively into or out of engagement with the blanket on the cylinder62. An impression handle 122 is provided for accomplishing thisadjustment, the handle being secured to a boss 124 which in turn issecured by a set screw 126 to the shaft 114. The boss 124 has a latchdog 128 pivoted at 127 to drop into a notch of a disc 130 on the frame30 in the impression position of the handle 122. This again is usualpractice.

Referring now (FIG. 6) to the micro-adjustment specifically, the platecylinder 34 rotates on ball bearings 131 which are slidablelongitudinally of the shaft 114 and are spaced apart by sleeves 132 and134, which have cam ends 132 and 134 respectively, located in a setcollar 136 so that relative rotation of these cam ends will provide anadjustment of the length of the spacer sleeve 132-134. The shaft 114 isprovide with a through-slot 138 in which a head 140 of a rod 142 ismounted. This head is connected by a pin 144 to the sleeve 134 so thatthis sleeve may be adjusted longitudinally of the shaft 114, thethrough-slot 138 being axially longer than the head 140 to permit ofsuch adjustment.

The rod 142 terminates in a threaded part extending out of theright-hand end of the shaft 114 in FIG. 6 which end is provided with acentral bore to accommodate the rod 142 and a micrometer adjusting nut145 is threaded thereon and graduated as indicated at 152 against anindex 154 on a set sleeve 148. A set collar is also located on thetubular portion of the shaft 114 against the impression handle 122 asshown in FIGS. 6 and 8. A lock nut 146 is provided for retaining theadjustment of the micrometer adjusting nut 145. A similar set collar 150is provided on the left-hand end of the shaft 114 against the turnbuckle112 at this end of the shaft.

It will be noted that the ends of the plate cylinder 34 are under-cut at156 relative to the printing plate 35. This prevents undesirablebuild-up of the ink transferred from the plate cylinder 34 to theblanket of the blanket cylinder 62, a common occurrence in priorprinting machines and a great nuisance.

Practical operation After the brackets 20 and 22 are installed on theframe members 16 and flanges 18 of the existing printing machine, ashereinbefore described, so that these brackets are in a fixed positionrelative thereto, my attachment press including the supporting bar 96from which the cap screws 104 have been removed and including the yokerod 110, is mounted with the bar 96 resting on the four set screws 106and 108 and with the rod 110 in the bores 118 as shown in FIG. 3whereupon the cap screws 104 are inserted through the ears 102 andscrewed into the mounting bar. The cap screws 104 are not tightened atthis time. The bushings 120 are slid from the dotted position shown inFIG. 4 to the solid line position within the bores 118 and set screws158 for the bushings 120 are tightened. My attachment press is thenready for adjusting of its plate cylinder shaft 114 to a position ofparallelism with respect to the blanket cylinder 62 of the existingprinting press. This is best done by adjusting the shaft 114 to a mentpress.

level position in a substantially vertical plane (providing of coursethe axis of the cylinder 62. is level) and then adjusting in asubstantially horizontal plane. For adjusting in the vertical plane thecap screws 104 are loosened and the set screws 106 and 108 adjusteduntil the shaft 114 is level or in a substantially horizontal planeparallel to a substantially horizontal plane passing through the axis ofthe blanket cylinder 62 whereupon the cap screws 104 are tightened.

The three lock nuts 98 below the supporting bar 96 (FIG. are thenloosened slightly for free pivoting of the supporting rod 86 about theaxis of the boss 88 and adjustment is accomplished by means of theturnbuckle .112 until the shaft 114 in its substantially vertical planeis parallel to a substantially vertical plane through the axis of theblanket cylinder 62. This is approximately determined by having theimpression handle 122 in the impression position (no printing plate 35on the cylinder 34) and sighting between the cylinder 34 and the blanketof the cylinder 62.

The press is now ready for checking parallelism by printing a horizontalline from the plate 35 or laying a stripe on the blanket. If the stripeis uneven in weight, the turnbuckles are adjusted until it is even allthe way across the blanket. When this stripe from the plate 35 isparallel to one from the plate cylinder 64, the press operator knows theshaft 114 is parallel to a horizontal plane through the axis of theblanket cylinder 62. The

shaft 114 is then parallel to the axis of the blanket cylinder 62, andthe lock nuts on the turnbuckles and the three lock nuts 98 aretightened.

My attachment press is now ready for operation to print a second coloron the same sheet and from the same blanket on the cylinder 62 thatprints from the plate cylinder 64 of the existing press. When only asingle color is to be run, my attachment press can be disengaged merelyby loosening the set screws 153 so that the bushings 120 can be shiftedtoward each other to the dotted position shown in FIG. 4 and the yokerod 110 willthen drop back in the bores 118 from the position shown inFIG. 3 to the position shown in FIG. 3 which .press may be entirelydemounted by the removal of the two cap screws 11M and the lifting ofthe press oif the ears 102 of the brackets 20 and 22, the yoke rod 110being lifted out of the bores 118 through the slots 116.

Another possibility is to let the attachment press idle particularly ifthe run is short and a two-color run is coming up immediately following.I

The adjustment of my attachment press, so that the axis of its shaft 114is level, is extremely important since the two plate cylinders 64 and 34make contact with the blanket along a given line and should 114 not belevel with 62, that line would appear crooked on the paper when it inturn is transferred from the blanket to the paper. To illustrate thispoint in exaggerated form, assume we have two identical printing plateswith an image of one horizontal straight line on each, and one of theseplates is put on the existing press and one on the attach- Next, assumethe cylinder 34 is 4 inch low on one end instead of parallel to the axisof the blanket cylinder. Since the plates are identical they shouldprint the two images, one right over the other. However, because theattachment press is not level, the line printed by it will fall A inchbelow the other image on one end. Obviously, it is extremely importantto have a leveling device to prevent this from happening. The cap screws104 and the four set screws 106 and 168 accomplish the desired resultadmirably. On the other hand, the turnbuckles 112 provide a convenientadjustment for laying the stripe from the printing plate evenly on theblanket and finally on the paper, and between the two types ofadjustments absolute parallelism of the cylinder 34 relative to thecylinder 62 is accomplished with a minimum of time and effort. Onceaccomplished, need for further adjustment is eliminated even though myattachment press is demounted and remounted at intervals.

The countersinking 119 of the bores 118 gives narrow bearing surfacesfor the bushings 120 in the brackets 24) and 22 which allows thebushings to tilt slightly in a self-aligning manner to accommodateslight differences in the position of alignment of the two brackets withrespect to each other. Were it not for this feature a slight twist inone bracket might cause the yoke shaft to be out of line and prevent itentering the bracket on the other side. The yoke bushings enterover-size bores so that the yoke shaft can be easily dropped throughslots and the bushings slipped into and out of the bores for quickmounting or demounting, and the bushings can be slipped out of the boresto allow the attachment press to tilt back just enough to disengage thedrive gear which in turn means it can set in place without idling, and

.to again start the attachment press one needs only to the turnbnckleswithout the danger of twisting or straining the attachment press.Heretofore, in registering two plates on a single blanket it wasnecessary to shift the printing plate bodily (after it is released froma clamped position on the cylinder) which presents a great problem whenthe amount it is to be moved is quite minute, such as a few thousandthsof an inch. My micro-adjustment facilitates the movement of the entireplate cylinder which accomplishes the same end but eliminates theproblem of releasing and thus losing control of the printing plateduring a registering operation. My arrangement is therefore moreaccurate and much faster and in fact the shift can be made while theprinting press is in operation.

With my micro-adjustment 145, the printing plate 35 does not have to bemoved on the cylinder 34 but rather the entire cylinder is moved whichallows hairline registration (that can be accomplished while running,ifdesired),

and the movement of the entire plate cylinder rather than the plate onthe cylinder facilitates another special design feature which is theunder-cut 156 beyond the edges of the plate. In this manner trackingfrom the edges of the plate cylinder onto the blanket is impossiblesince the printing forms do not bear on this area.

Some changes may be made in the construction and arrangement of theparts of my printing press without departing from the real spirit andpurpose of my invention, and it is my intention to cover by my claimsany modified forms of structure or use of mechanical equivalents whichmay reasonably be included within their scope.

I claim as my invention:

1. In an attachable printing press of the character disclosed forremovable attachment in cooperative relationship with an existingprinting press and having a printing cylinder to cooperate with theprinting cylinder of the existing printing press, a pair of laterallyspaced brackets, one for attachment to each side frame of the existingprinting press, a horizontal supporting bar having its ends supported onand vertically adjustable relative to said brackets, a supporting rodpivoted on a vertical axis to said yoke rod, said yoke rod ends beingcarried by said brackets and said adjustable connections effectingpivotal adjustment of said rod and thereby alignment of said printingcylinder of said attachable printing press relative to the printingcylinder of the existing printing press, and'means to thereafter locksaid supporting rod against pivotal movement relative to said supportingbar.

2. An attachable printing press for an existing printing presscomprising a pair of brackets, one for attachment to each side frame ofthe existing printing press, the means for attachment comprising atleast two U-shaped portions on each bracket to receive flanges of theexisting printing press frame, opposite set screws in each U-shapedportion to set against said flanges, a supporting bar having its endssupported on said brackets, the means of support comprising set screwsin said brackets for said supporting bar to contact and cap screws forholding the supporting bar against said set screws, a supporting rodpivoted to said supporting bar and connected to the attachable printingpress to support it, a yoke rod, turnbuckle connections between saidattachable printing press and said yoke rod to adjust their angularrelationship and thereby the printing cylinder of the attachableprinting press relative to the printing cylinder of the existingprinting press, said yoke rod being removably carried by said pair ofbrackets by means of enlarged bores of said brackets to receive saidyoke rod, said brackets having narrow entrance slots to said bores topermit entrance of said yoke therein, bushings slidable on said yokerodinto and out of said bores, and means to lock said supporting rodagainst pivotal movement relative to said supporting bar.

3. In an attachable printing press for an existing printing press, apair of brackets, one for attachment to each side frame of the existingprinting press, an supporting bar having its ends supported on saidbrackets, the means of support comprising set screws in said bracketsfor said supporting bar to contact and cap screws for holding thesupporting bar against said set screws, a supporting rod pivoted to saidsupporting bar and connected to the attachable printing press to supportit, a yoke rod, turnbuckle connections between said attachable printingpress and said yoke rod to adjust the angle of the attachable pressrelative to the existing press, said yoke rod being removably carried bysaid pair of brackets by means of enlarged bores of said brackets toreceive said yoke rod, said brackets having narrow entrance slots tosaid bores to permit entrance of said yoke rod therein, bushingsslidable on said yoke rod into and out of said bores, and means to locksaid supporting rod against pivotal movement relative to said supportingbar after adjustment of said turnbuckle connections.

4. In an attachable printing press for an existing printing press, apair of brackets, one for attachment to each side frame of the existingprinting press, a supporting bar having its ends supported on saidbrackets, the means of support comprising set screws in said bracketsfor said supporting bar to contact and cap screws for holding thesupporting bar against said set screws, a supporting rod pivoted to saidsupporting bar and connected to the attachable printing press to supportit, a yoke rod, turnbuckle connections between said attachable printingpress and said yoke rod, said yoke rod being removably carried by saidpair of brackets whereby adjustment of said turnbuckle connectionschanges the angle of the printing cylinder of said attachable printingpress relative to the existing printing press, and means to lock saidsupporting rod against pivotal movement relative to said supporting barafter such adjustment.

5. For use with an existing printing press, an attachable printing pressof the character disclosed comprising a pair of brackets, one forattachment to each side frame of the existing printing press, the meansof attachment comprising at least two U-shaped portions on each bracketto receive flanges of the existing printing press frame, op-

posite set screw in each U-shaped portion to set against said flanges, asupporting bar having its ends supported on and vertically adjustablerelative to said brackets, a supporting rod centrally pivoted on saidsupporting bar and connected to the attachable printing press to supportit, a yoke rod, adjustable connections between said attachable printingpress and said yoke rod, said yoke rod being carried by said pair ofbrackets, and means to lock said supporting rod against pivotal movementrelative to said supporting bar after adjustment of said adjustableconnections to vary the angle of said attachable printing press relativeto the existing printing press comprising slot and clamp boltconnections between portions of said supporting rod spaced from saidpivotal connection and said supporting bar.

6. A printing press comprising a pair of brackets, one for attachment toeach side frame of an existing printing press, a supporting bar havingits ends supported on and vertically adjustable relative to saidbrackets, the means of adjustment comprising set screws in said bracketsfor said supporting bar to contact and cap screws for holding thesupporting bar against said set screws, a supporting rod pivoted to saidsupporting bar and connected to the attachable printing press to supportit, a yoke rod, adjustable turnbuckle connections between saidattachable printing press and said yoke rod, said yoke rod beingremovably carried by said pair of brackets by means of enlarged bores ofsaid brackets to receive said yoke rod, said brackets having narrowentrance slots to said bores to permit entrance of said yoke rodtherein, bushings slidable on said yoke rod into and out of said boresto prevent removal of said yoke rod from said bores, and means to locksaid supporting rod against pivotal movement relative to said supportingbar after said turnbuckle connections have been adjusted comprising slotand clamp bolt connections between said supporting rod and saidsupporting bar.

7. An attachable printing press comprising a pair of brackets, one forattachment to each side frame of an existing printing press, the meansof attachment comprising at least two U-shaped portions on each bracketto receive flanges of the existing printing press frame, opposite setscrews in each U-shaped portion set against said flanges, a supportingbar having its ends supported on said brackets, the means of supportcomprising set screws in said brackets for said supporting bar tocontact and cap screws for holding said supporting bar against said setscrews, a supporting rod pivoted to said supporting bar and connected tothe attachable printing press to support it, a yoke rod, turnbuckleconnections between said attachable printing press and said yoke rod,said yoke rod being removably carried by said pair of brackets by meansof enlarged bores of said brackets to receive said yoke rod, saidbrackets having narrow entrance slots to said bores to permit entranceof said yoke rod therein, bushings slidable on said yoke rod into andout of said bores, and means to lock said supporting rod against pivotalmovement relative to said supporting bar after said turnbuckleconnections have been adjusted comprising slot and clamp boltconnections between portions of said supporting rod spaced from saidpivotal connection and said supporting bar.

8. In an attachable printing press of the character disclosed, a pair ofbrackets, one for attachment to each of the side frames of an existingprinting press, means for mounting the attachable printing press on saidbrackets, a horizontal supporting bar having its ends supported on andvertically adjustable relative to said brackets, a supporitng rodpivoted on a vertical axis to said supporting bar and connected to theattachable printing press to support it, a yoke rod generally parallelto said supporting rod, adjustable connections between said attachableprinting press and said yoke rod to vary the angle of said attachableprinting press relative to said yoke rod, said yoke rod being carried bysaid pair of brackets, means to lock said supporting rod against pivotalmovement relative to said supporting bar after said adjustableconnections are adjusted, said attachable printing press including aplate cylinder, means for securing a printing plate thereto, the ends ofsaid plate cylinder being undercut relative to the ends of said printingplate to prevent ink tracking on the blanket of a blanket cylinder ofthe existing printing press.

9. In an attachable printing press for an existing printing press, apair of brackets, one for attachment to each side frame of the existingprinting press, a supporting bar having its ends supported for verticaladjustment on said brackets, a supporting rod pivoted centrally to saidsupporting bar and connected to the attachable printing press to supportit, a yoke rod spaced from and parallel to said supporting rod,adjustable connections between said supporting rod and said yoke rod,said yoke rod being removably carried by said pair of brackets, andmeans to lock said supporting rod against pivotal movement relative tosaid supporting bar after adjustments of said adjustable connectionshave been made, said attachable printing press including a platecylinder, and means for securing a printing plate thereto.

10. In an attachable printing press of the character disclosed, a pairof brackets, one for attachment to each side frame of an existingprinting press, a supporting bar having its ends supported foradjustment toward and from said brackets, a supporting rod pivotedcentrally to said supporting bar and connected to the attachableprinting press to support it, a yoke rod, adjustable connections betweensaid supporting and yoke rods, said yoke rod being removably carried bysaid pair of brackets, and means to lock said supporting rod againstpivotal move ment relative to said supporting bar fol-lowingmanipulation of said adjustable connections, said attachable printingpress including a plate cylinder, means for securing a printing platethereto, the ends of said plate cylinder being undercut relative to theends of said printing plate to prevent ink tracking on the blanket ofthe existing printing press.

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